linux-kernel - Re: [RFC 1/2] lib/vsprintf: Add support for pte

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Message-ID: <8f41d3ed-d490-4207-a907-75090c81bfc9@redhat.com>
Date: Wed, 18 Jun 2025 10:43:43 +0200
From: David Hildenbrand <david@...hat.com>
To: Anshuman Khandual <anshuman.khandual@....com>, linux-mm@...ck.org
Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
 Rasmus Villemoes <linux@...musvillemoes.dk>,
 Sergey Senozhatsky <senozhatsky@...omium.org>, Petr Mladek
 <pmladek@...e.com>, Steven Rostedt <rostedt@...dmis.org>,
 Jonathan Corbet <corbet@....net>, Andrew Morton <akpm@...ux-foundation.org>,
 linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [RFC 1/2] lib/vsprintf: Add support for pte_t

On 18.06.25 10:33, Anshuman Khandual wrote:
> 
> 
> On 18/06/25 1:49 PM, David Hildenbrand wrote:
>>> +    case 'p':
>>> +        if (fmt[1] == 't' && fmt[2] == 'e') {
>>> +            pte_t *pte = (pte_t *)ptr;
>>> +
>>> +            spec.field_width = 10;
>>> +            spec.precision = 8;
>>> +            spec.base = 16;
>>> +            spec.flags = SPECIAL | SMALL | ZEROPAD;
>>> +            if (sizeof(pte_t) == sizeof(u64)) {
>>> +                u64 val = pte_val(*pte);
>>> +
>>> +                return number(buf, end, val, spec);
>>> +            }
>>> +            WARN_ONCE(1, "Non standard pte_t\n");
>>
>> What about 32bit with 32bit pte_t?
> 
> Ahh, missed that. Just wondering which all platforms might
> care about the 32 bit pte representation.

I think e.g., 32bit arm has 32bit ptes?

arch/arm/include/asm/pgtable-2level-types.h

typedef u32 pteval_t;
...
typedef struct { pteval_t pte; } pte_t;

-- 
Cheers,

David / dhildenb